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Small vibration units in cell phone.

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steven2410

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Hi everyone. So I have this idea to build a card holder that will vibrate (like a phone) when a card slip out of place. In order to do that, i need a a small vibration motor! I end up extract one from the old nokia phone but it's doesn't work when connect to DC supply. Does it need a oscillating voltage supply to work? How to achieve maximum vibration? Is there any places i can get similar thing?
 

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